Installing A Trailer Towing Wiring Harness When A Flat Towing Wiring Harness Is Already Installed

Updated 04/29/2026 | Published 04/26/2026

Question:

ive got my jeep setup to tow behind motorhome.. installed a plug and play wiring kit to the tail lites.. now i would like to add a 4 way flat plug at rear of jeep to tow my small fishing boat. do you sell a wiring plug and play setup for that?

asked by: victor h

Expert Reply:

Welcome back Victor!

To add a 4-Flat to your 2025 Jeep Wrangler that you have set up for flat towing, you will want the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 56407.

This is plug and play, but you will need to run a wire to the battery for needed power. Plugging this in with a plug and play flat tow wiring harness is a totally normal thing to do and we have a lot of people do it as well. You can stack these any way you like, but I typically go Vehicle to trailer harness, trailer harness to flat towing harness, flat towing harness to lights. You might need to get a little creative with all the plugs in the light housing area, but it shouldn't be too bad.

What kind of fishing boat do you have? Catch anything good this year?

expert reply by: Lazer S